Under and above ground, radio frequency driven element, vector display, metal locating system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Oct 21, 2003
Grant Date -
N/A
app pub date -
Sep 7, 2001
filing date -
Sep 7, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for locating underground or above ground metal and pipe objects includes a transmitter for generating an RF signal which is applied to the object which acts as a transmitter. An above-ground antenna array receives the RF signal transmitted by the underground object with a commutator for periodically and sequentially receiving signal from each antenna in the array, the commutator frequency modulating the received signal. A FM demodulator then demodulates the signal from the commutator and provides a Doppler effect frequency shift signal. A vector positional display then indicates position of the object based on the Doppler effect frequency shift signal relative to a reference signal.
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Cited Art Landscape
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